[PATCH v4 6/8] staging: zcache: fix static variables defined in debug.h but used in mutiple C files

[Wanpeng Li]

After commit 95bdaee214 ("zcache: Move debugfs code out of zcache-main.c file") 
be merged, most of knods in zcache debugfs just export zero since these variables
are defined in debug.h but use in multiple C files zcache-main.c and debug.c, in 
this case variables can't be treated as shared variables.

Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
---
 drivers/staging/zcache/debug.h       |   62 +++++++++++++++++-----------------
 drivers/staging/zcache/zcache-main.c |   31 +++++++++++++++++
 2 files changed, 62 insertions(+), 31 deletions(-)

diff --git a/drivers/staging/zcache/debug.h b/drivers/staging/zcache/debug.h
index 4bbe49b..8ec82d4 100644
--- a/drivers/staging/zcache/debug.h
+++ b/drivers/staging/zcache/debug.h
@@ -3,9 +3,9 @@
 #ifdef CONFIG_ZCACHE_DEBUG
 
 /* we try to keep these statistics SMP-consistent */
-static ssize_t zcache_obj_count;
+extern ssize_t zcache_obj_count;
 static atomic_t zcache_obj_atomic = ATOMIC_INIT(0);
-static ssize_t zcache_obj_count_max;
+extern ssize_t zcache_obj_count_max;
 static inline void inc_zcache_obj_count(void)
 {
 	zcache_obj_count = atomic_inc_return(&zcache_obj_atomic);
@@ -17,9 +17,9 @@ static inline void dec_zcache_obj_count(void)
 	zcache_obj_count = atomic_dec_return(&zcache_obj_atomic);
 	BUG_ON(zcache_obj_count < 0);
 };
-static ssize_t zcache_objnode_count;
+extern ssize_t zcache_objnode_count;
 static atomic_t zcache_objnode_atomic = ATOMIC_INIT(0);
-static ssize_t zcache_objnode_count_max;
+extern ssize_t zcache_objnode_count_max;
 static inline void inc_zcache_objnode_count(void)
 {
 	zcache_objnode_count = atomic_inc_return(&zcache_objnode_atomic);
@@ -31,9 +31,9 @@ static inline void dec_zcache_objnode_count(void)
 	zcache_objnode_count = atomic_dec_return(&zcache_objnode_atomic);
 	BUG_ON(zcache_objnode_count < 0);
 };
-static u64 zcache_eph_zbytes;
+extern u64 zcache_eph_zbytes;
 static atomic_long_t zcache_eph_zbytes_atomic = ATOMIC_INIT(0);
-static u64 zcache_eph_zbytes_max;
+extern u64 zcache_eph_zbytes_max;
 static inline void inc_zcache_eph_zbytes(unsigned clen)
 {
 	zcache_eph_zbytes = atomic_long_add_return(clen, &zcache_eph_zbytes_atomic);
@@ -46,7 +46,7 @@ static inline void dec_zcache_eph_zbytes(unsigned zsize)
 };
 extern  u64 zcache_pers_zbytes;
 static atomic_long_t zcache_pers_zbytes_atomic = ATOMIC_INIT(0);
-static u64 zcache_pers_zbytes_max;
+extern u64 zcache_pers_zbytes_max;
 static inline void inc_zcache_pers_zbytes(unsigned clen)
 {
 	zcache_pers_zbytes = atomic_long_add_return(clen, &zcache_pers_zbytes_atomic);
@@ -59,7 +59,7 @@ static inline void dec_zcache_pers_zbytes(unsigned zsize)
 }
 extern ssize_t zcache_eph_pageframes;
 static atomic_t zcache_eph_pageframes_atomic = ATOMIC_INIT(0);
-static ssize_t zcache_eph_pageframes_max;
+extern ssize_t zcache_eph_pageframes_max;
 static inline void inc_zcache_eph_pageframes(void)
 {
 	zcache_eph_pageframes = atomic_inc_return(&zcache_eph_pageframes_atomic);
@@ -72,7 +72,7 @@ static inline void dec_zcache_eph_pageframes(void)
 };
 extern ssize_t zcache_pers_pageframes;
 static atomic_t zcache_pers_pageframes_atomic = ATOMIC_INIT(0);
-static ssize_t zcache_pers_pageframes_max;
+extern ssize_t zcache_pers_pageframes_max;
 static inline void inc_zcache_pers_pageframes(void)
 {
 	zcache_pers_pageframes = atomic_inc_return(&zcache_pers_pageframes_atomic);
@@ -83,21 +83,21 @@ static inline void dec_zcache_pers_pageframes(void)
 {
 	zcache_pers_pageframes = atomic_dec_return(&zcache_pers_pageframes_atomic);
 }
-static ssize_t zcache_pageframes_alloced;
+extern ssize_t zcache_pageframes_alloced;
 static atomic_t zcache_pageframes_alloced_atomic = ATOMIC_INIT(0);
 static inline void inc_zcache_pageframes_alloced(void)
 {
 	zcache_pageframes_alloced = atomic_inc_return(&zcache_pageframes_alloced_atomic);
 };
-static ssize_t zcache_pageframes_freed;
+extern ssize_t zcache_pageframes_freed;
 static atomic_t zcache_pageframes_freed_atomic = ATOMIC_INIT(0);
 static inline void inc_zcache_pageframes_freed(void)
 {
 	zcache_pageframes_freed = atomic_inc_return(&zcache_pageframes_freed_atomic);
 }
-static ssize_t zcache_eph_zpages;
+extern ssize_t zcache_eph_zpages;
 static atomic_t zcache_eph_zpages_atomic = ATOMIC_INIT(0);
-static ssize_t zcache_eph_zpages_max;
+extern ssize_t zcache_eph_zpages_max;
 static inline void inc_zcache_eph_zpages(void)
 {
 	zcache_eph_zpages = atomic_inc_return(&zcache_eph_zpages_atomic);
@@ -110,7 +110,7 @@ static inline void dec_zcache_eph_zpages(unsigned zpages)
 }
 extern ssize_t zcache_pers_zpages;
 static atomic_t zcache_pers_zpages_atomic = ATOMIC_INIT(0);
-static ssize_t zcache_pers_zpages_max;
+extern ssize_t zcache_pers_zpages_max;
 static inline void inc_zcache_pers_zpages(void)
 {
 	zcache_pers_zpages = atomic_inc_return(&zcache_pers_zpages_atomic);
@@ -130,23 +130,23 @@ static inline unsigned long curr_pageframes_count(void)
 		atomic_read(&zcache_pers_pageframes_atomic);
 };
 /* but for the rest of these, counting races are ok */
-static ssize_t zcache_flush_total;
-static ssize_t zcache_flush_found;
-static ssize_t zcache_flobj_total;
-static ssize_t zcache_flobj_found;
-static ssize_t zcache_failed_eph_puts;
-static ssize_t zcache_failed_pers_puts;
-static ssize_t zcache_failed_getfreepages;
-static ssize_t zcache_failed_alloc;
-static ssize_t zcache_put_to_flush;
-static ssize_t zcache_compress_poor;
-static ssize_t zcache_mean_compress_poor;
-static ssize_t zcache_eph_ate_tail;
-static ssize_t zcache_eph_ate_tail_failed;
-static ssize_t zcache_pers_ate_eph;
-static ssize_t zcache_pers_ate_eph_failed;
-static ssize_t zcache_evicted_eph_zpages;
-static ssize_t zcache_evicted_eph_pageframes;
+extern ssize_t zcache_flush_total;
+extern ssize_t zcache_flush_found;
+extern ssize_t zcache_flobj_total;
+extern ssize_t zcache_flobj_found;
+extern ssize_t zcache_failed_eph_puts;
+extern ssize_t zcache_failed_pers_puts;
+extern ssize_t zcache_failed_getfreepages;
+extern ssize_t zcache_failed_alloc;
+extern ssize_t zcache_put_to_flush;
+extern ssize_t zcache_compress_poor;
+extern ssize_t zcache_mean_compress_poor;
+extern ssize_t zcache_eph_ate_tail;
+extern ssize_t zcache_eph_ate_tail_failed;
+extern ssize_t zcache_pers_ate_eph;
+extern ssize_t zcache_pers_ate_eph_failed;
+extern ssize_t zcache_evicted_eph_zpages;
+extern ssize_t zcache_evicted_eph_pageframes;
 
 extern ssize_t zcache_last_active_file_pageframes;
 extern ssize_t zcache_last_inactive_file_pageframes;
diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index 892e97e..d1118f0 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -145,6 +145,37 @@ ssize_t zcache_pers_zpages;
 u64 zcache_pers_zbytes;
 ssize_t zcache_eph_pageframes;
 ssize_t zcache_pers_pageframes;
+ssize_t zcache_obj_count;
+ssize_t zcache_obj_count_max;
+ssize_t zcache_objnode_count;
+ssize_t zcache_objnode_count_max;
+u64 zcache_eph_zbytes;
+u64 zcache_eph_zbytes_max;
+u64 zcache_pers_zbytes_max;
+ssize_t zcache_eph_pageframes_max;
+ssize_t zcache_pers_pageframes_max;
+ssize_t zcache_pageframes_alloced;
+ssize_t zcache_pageframes_freed;
+ssize_t zcache_eph_zpages;
+ssize_t zcache_eph_zpages_max;
+ssize_t zcache_pers_zpages_max;
+ssize_t zcache_flush_total;
+ssize_t zcache_flush_found;
+ssize_t zcache_flobj_total;
+ssize_t zcache_flobj_found;
+ssize_t zcache_failed_eph_puts;
+ssize_t zcache_failed_pers_puts;
+ssize_t zcache_failed_getfreepages;
+ssize_t zcache_failed_alloc;
+ssize_t zcache_put_to_flush;
+ssize_t zcache_compress_poor;
+ssize_t zcache_mean_compress_poor;
+ssize_t zcache_eph_ate_tail;
+ssize_t zcache_eph_ate_tail_failed;
+ssize_t zcache_pers_ate_eph;
+ssize_t zcache_pers_ate_eph_failed;
+ssize_t zcache_evicted_eph_zpages;
+ssize_t zcache_evicted_eph_pageframes;
 
 /* Used by this code. */
 ssize_t zcache_last_active_file_pageframes;
-- 
1.7.7.6

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